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CBSE Class 12-science Answered

please solve the question in the picture.
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Asked by rohitraman1115 | 13 Jan, 2019, 01:04: PM
answered-by-expert Expert Answer
Torque τ acting on a coil is given by
begin mathsize 12px style stack tau space space space with rightwards arrow on top space equals space stack mu space with rightwards arrow on top space bold cross times stack bold B bold space with bold rightwards arrow on top bold space............. left parenthesis 1 right parenthesis bold space end style
where μ is magnetic moment of the coil = N×I×πr², N is number of turns, I is current passing through the coil and r is the radius.
Since the coil is in xy-plane, magnetic moment vector is in z-axis.
 
begin mathsize 12px style tau space equals space open vertical bar table row i j k row 0 0 cell N I πr squared end cell row cell B subscript x end cell cell B subscript y end cell cell B subscript z end cell end table close vertical bar space equals space i with hat on top space open parentheses negative B subscript y N I πr squared close parentheses space minus j with hat on top open parentheses negative B subscript x N space I space πr squared close parentheses space equals space N space I space πr squared open parentheses negative B subscript y space space i with hat on top space plus space B subscript x space j with hat on top space close parentheses end style
Answered by Thiyagarajan K | 13 Jan, 2019, 01:55: PM

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CBSE 12-science - Physics
explain this concept
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Asked by panneer1766 | 24 Apr, 2024, 01:52: PM
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CBSE 12-science - Physics
A dumbbell consists of two masses A and B each of mass m joined by a light rod of length l with mass B attached to a suspension point O by a light rod of length l as shown in figure. Find the minimum required speed with which mass A to be projected horizontally so that the system completes the vertical circular motion.
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CBSE 12-science - Physics
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CBSE 12-science - Physics
please resolve with good explanation
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Asked by kulhariabhijeet | 21 Apr, 2024, 02:39: PM
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CBSE 12-science - Physics
what are ghost particles please answer how is that not able to interact with other subatomic particles ..?is that faster than photons?
Asked by mohapatraswetalina88 | 21 Apr, 2024, 12:18: PM
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CBSE 12-science - Physics
if breakdown voltage of each capacitor is 40v ,then maximum applied voltage Vmax will be
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CBSE 12-science - Physics
explain
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Asked by ranadeb8090 | 19 Apr, 2024, 03:32: PM
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CBSE 12-science - Physics
solve option e
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Asked by dasrituparna1999 | 13 Apr, 2024, 06:56: AM
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CBSE 12-science - Physics
The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4. n= A The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
Asked by dasrituparna1999 | 12 Apr, 2024, 09:26: PM
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CBSE 12-science - Physics
which answer is correct and most appropriate with explanation
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Asked by mishrigupta19319 | 08 Apr, 2024, 06:28: PM
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